发明授权
- 专利标题： Method of copying transparent originals and photographic copier
- 专利标题（中）： 复印透明原件和复印机的方法
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申请号： US944127申请日： 1997-10-06
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公开(公告)号： US5978066A公开(公告)日： 1999-11-02
- 发明人: Helmut Treiber , Friedrich Jacob , Gunter Findeis
- 申请人： Helmut Treiber , Friedrich Jacob , Gunter Findeis
- 申请人地址： DEX Leverkusen
- 专利权人： Agfa-Gevaert AG
- 当前专利权人： Agfa-Gevaert AG
- 当前专利权人地址： DEX Leverkusen
- 主分类号： G03B27/32
- IPC分类号： G03B27/32 ; G03B27/52 ; G03B27/72
摘要：
Film frames are scanned preparatory to copying and a set of density values is generated for each frame. When a frame exhibits excessive contrast, a mask is calculated using the respective set of density values. The calculated mask is formed on an LCD or LED matrix which is in register with the frame. An image of the masked frame is then projected onto copy paper by a zoom objective. The mask has a size which is a function of the magnification factor and/or the mask-to-frame distance.